Isuzu A-6BG1 - Troubleshooting - Abnormal Engine Noise

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TROUBLESHOOTINQ 12-21
~~
ABNORMAL ENGINE NOISE
1. Engine Knocking
Checkpoint Trouble Cause
Remedy
Check to see that the engine has been thoroughly warmed up before beginning the troubleshooting procedure.
Fuel
NG
OK
Fuel unsuitable
NG
H
Replace the fuel
Fuel injection timing
NG
Fuel injection timing improperly
NG
.
adjusted
Adjust the fuel injection timing
OK
1
injection nozzle
NG
Improper injection nozzle starting NG Adjust or replace the injection
pressure and spray condition nozzle
. -
4
OK 1
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1 I
Compression pressure
NG
t-i
Blown out head gasket
Broken piston ring
NG
2. Gas Leakage Noise
Replace the head gasket or the
piston ring
-
. .
Exhaust pipes
NG Loosely connected exhaust pipes
NG
Tighten the exhaust pipe
Broken exhaust pipes
connections
Replace the exhaust pipes
1
I
J 4 L
1
r
OK
Injection nozzles and/or glow
- plugs
r
.
FIG Loose injection nozzle6 and/or NG
Replace the washers
glow plugs
Tighten the injection nozzles
and/or the glow plugs
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Continued on the next page
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